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<pre><a name="line-1"></a>
<a name="line-2"></a><span class='hs-comment'>-- | An architecture independent description of a register.</span>
<a name="line-3"></a><span class='hs-comment'>-- This needs to stay architecture independent because it is used</span>
<a name="line-4"></a><span class='hs-comment'>-- by NCGMonad and the register allocators, which are shared</span>
<a name="line-5"></a><span class='hs-comment'>-- by all architectures.</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Reg</span> <span class='hs-layout'>(</span>
<a name="line-8"></a> <span class='hs-conid'>RegNo</span><span class='hs-layout'>,</span>
<a name="line-9"></a> <span class='hs-conid'>Reg</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-10"></a> <span class='hs-varid'>regPair</span><span class='hs-layout'>,</span>
<a name="line-11"></a> <span class='hs-varid'>regSingle</span><span class='hs-layout'>,</span>
<a name="line-12"></a> <span class='hs-varid'>isRealReg</span><span class='hs-layout'>,</span> <span class='hs-varid'>takeRealReg</span><span class='hs-layout'>,</span>
<a name="line-13"></a> <span class='hs-varid'>isVirtualReg</span><span class='hs-layout'>,</span> <span class='hs-varid'>takeVirtualReg</span><span class='hs-layout'>,</span>
<a name="line-14"></a>
<a name="line-15"></a> <span class='hs-conid'>VirtualReg</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-16"></a> <span class='hs-varid'>renameVirtualReg</span><span class='hs-layout'>,</span>
<a name="line-17"></a> <span class='hs-varid'>classOfVirtualReg</span><span class='hs-layout'>,</span>
<a name="line-18"></a> <span class='hs-varid'>getHiVirtualRegFromLo</span><span class='hs-layout'>,</span>
<a name="line-19"></a> <span class='hs-varid'>getHiVRegFromLo</span><span class='hs-layout'>,</span>
<a name="line-20"></a>
<a name="line-21"></a> <span class='hs-conid'>RealReg</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-varid'>regNosOfRealReg</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-varid'>realRegsAlias</span><span class='hs-layout'>,</span>
<a name="line-24"></a>
<a name="line-25"></a> <span class='hs-varid'>liftPatchFnToRegReg</span>
<a name="line-26"></a><span class='hs-layout'>)</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-keyword'>where</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Outputable</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Unique</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>RegClass</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-34"></a>
<a name="line-35"></a><a name="RegNo"></a><span class='hs-comment'>-- | An identifier for a primitive real machine register.</span>
<a name="line-36"></a><a name="RegNo"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>RegNo</span>
<a name="line-37"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="VirtualReg"></a><span class='hs-comment'>-- VirtualRegs are virtual registers. The register allocator will</span>
<a name="line-40"></a><a name="VirtualReg"></a><span class='hs-comment'>-- eventually have to map them into RealRegs, or into spill slots.</span>
<a name="line-41"></a><a name="VirtualReg"></a><span class='hs-comment'>--</span>
<a name="line-42"></a><a name="VirtualReg"></a><span class='hs-comment'>-- VirtualRegs are allocated on the fly, usually to represent a single</span>
<a name="line-43"></a><a name="VirtualReg"></a><span class='hs-comment'>-- value in the abstract assembly code (i.e. dynamic registers are</span>
<a name="line-44"></a><a name="VirtualReg"></a><span class='hs-comment'>-- usually single assignment). </span>
<a name="line-45"></a><a name="VirtualReg"></a><span class='hs-comment'>--</span>
<a name="line-46"></a><a name="VirtualReg"></a><span class='hs-comment'>-- The single assignment restriction isn't necessary to get correct code,</span>
<a name="line-47"></a><a name="VirtualReg"></a><span class='hs-comment'>-- although a better register allocation will result if single</span>
<a name="line-48"></a><a name="VirtualReg"></a><span class='hs-comment'>-- assignment is used -- because the allocator maps a VirtualReg into</span>
<a name="line-49"></a><a name="VirtualReg"></a><span class='hs-comment'>-- a single RealReg, even if the VirtualReg has multiple live ranges.</span>
<a name="line-50"></a><a name="VirtualReg"></a><span class='hs-comment'>--</span>
<a name="line-51"></a><a name="VirtualReg"></a><span class='hs-comment'>-- Virtual regs can be of either class, so that info is attached.</span>
<a name="line-52"></a><a name="VirtualReg"></a><span class='hs-comment'>--</span>
<a name="line-53"></a><a name="VirtualReg"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>VirtualReg</span>
<a name="line-54"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>VirtualRegI</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Unique</span>
<a name="line-55"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>VirtualRegHi</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Unique</span> <span class='hs-comment'>-- High part of 2-word register</span>
<a name="line-56"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>VirtualRegF</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Unique</span>
<a name="line-57"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>VirtualRegD</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Unique</span>
<a name="line-58"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>)</span>
<a name="line-59"></a>
<a name="line-60"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Uniquable</span> <span class='hs-conid'>VirtualReg</span> <span class='hs-keyword'>where</span>
<a name="line-61"></a> <span class='hs-varid'>getUnique</span> <span class='hs-varid'>reg</span>
<a name="line-62"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-63"></a> <span class='hs-conid'>VirtualRegI</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>u</span>
<a name="line-64"></a> <span class='hs-conid'>VirtualRegHi</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>u</span>
<a name="line-65"></a> <span class='hs-conid'>VirtualRegF</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>u</span>
<a name="line-66"></a> <span class='hs-conid'>VirtualRegD</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>u</span>
<a name="line-67"></a>
<a name="line-68"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Outputable</span> <span class='hs-conid'>VirtualReg</span> <span class='hs-keyword'>where</span>
<a name="line-69"></a> <span class='hs-varid'>ppr</span> <span class='hs-varid'>reg</span>
<a name="line-70"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-71"></a> <span class='hs-conid'>VirtualRegI</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>text</span> <span class='hs-str'>"%vI_"</span> <span class='hs-varop'><></span> <span class='hs-varid'>pprUnique</span> <span class='hs-varid'>u</span>
<a name="line-72"></a> <span class='hs-conid'>VirtualRegHi</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>text</span> <span class='hs-str'>"%vHi_"</span> <span class='hs-varop'><></span> <span class='hs-varid'>pprUnique</span> <span class='hs-varid'>u</span>
<a name="line-73"></a> <span class='hs-conid'>VirtualRegF</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>text</span> <span class='hs-str'>"%vF_"</span> <span class='hs-varop'><></span> <span class='hs-varid'>pprUnique</span> <span class='hs-varid'>u</span>
<a name="line-74"></a> <span class='hs-conid'>VirtualRegD</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>text</span> <span class='hs-str'>"%vD_"</span> <span class='hs-varop'><></span> <span class='hs-varid'>pprUnique</span> <span class='hs-varid'>u</span>
<a name="line-75"></a>
<a name="line-76"></a>
<a name="line-77"></a><a name="renameVirtualReg"></a><span class='hs-definition'>renameVirtualReg</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Unique</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VirtualReg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VirtualReg</span>
<a name="line-78"></a><span class='hs-definition'>renameVirtualReg</span> <span class='hs-varid'>u</span> <span class='hs-varid'>r</span>
<a name="line-79"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-80"></a> <span class='hs-conid'>VirtualRegI</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VirtualRegI</span> <span class='hs-varid'>u</span>
<a name="line-81"></a> <span class='hs-conid'>VirtualRegHi</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VirtualRegHi</span> <span class='hs-varid'>u</span>
<a name="line-82"></a> <span class='hs-conid'>VirtualRegF</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VirtualRegF</span> <span class='hs-varid'>u</span>
<a name="line-83"></a> <span class='hs-conid'>VirtualRegD</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VirtualRegD</span> <span class='hs-varid'>u</span>
<a name="line-84"></a>
<a name="line-85"></a>
<a name="line-86"></a><a name="classOfVirtualReg"></a><span class='hs-definition'>classOfVirtualReg</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>VirtualReg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegClass</span>
<a name="line-87"></a><span class='hs-definition'>classOfVirtualReg</span> <span class='hs-varid'>vr</span>
<a name="line-88"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>vr</span> <span class='hs-keyword'>of</span>
<a name="line-89"></a> <span class='hs-conid'>VirtualRegI</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RcInteger</span>
<a name="line-90"></a> <span class='hs-conid'>VirtualRegHi</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RcInteger</span>
<a name="line-91"></a> <span class='hs-conid'>VirtualRegF</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RcFloat</span>
<a name="line-92"></a> <span class='hs-conid'>VirtualRegD</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RcDouble</span>
<a name="line-93"></a>
<a name="line-94"></a>
<a name="line-95"></a><a name="getHiVirtualRegFromLo"></a><span class='hs-comment'>-- Determine the upper-half vreg for a 64-bit quantity on a 32-bit platform</span>
<a name="line-96"></a><span class='hs-comment'>-- when supplied with the vreg for the lower-half of the quantity.</span>
<a name="line-97"></a><span class='hs-comment'>-- (NB. Not reversible).</span>
<a name="line-98"></a><span class='hs-definition'>getHiVirtualRegFromLo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>VirtualReg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VirtualReg</span>
<a name="line-99"></a><span class='hs-definition'>getHiVirtualRegFromLo</span> <span class='hs-varid'>reg</span>
<a name="line-100"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-101"></a> <span class='hs-comment'>-- makes a pseudo-unique with tag 'H'</span>
<a name="line-102"></a> <span class='hs-conid'>VirtualRegI</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VirtualRegHi</span> <span class='hs-layout'>(</span><span class='hs-varid'>newTagUnique</span> <span class='hs-varid'>u</span> <span class='hs-chr'>'H'</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>panic</span> <span class='hs-str'>"Reg.getHiVirtualRegFromLo"</span>
<a name="line-104"></a>
<a name="line-105"></a><a name="getHiVRegFromLo"></a><span class='hs-definition'>getHiVRegFromLo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Reg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Reg</span>
<a name="line-106"></a><span class='hs-definition'>getHiVRegFromLo</span> <span class='hs-varid'>reg</span>
<a name="line-107"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-108"></a> <span class='hs-conid'>RegVirtual</span> <span class='hs-varid'>vr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegVirtual</span> <span class='hs-layout'>(</span><span class='hs-varid'>getHiVirtualRegFromLo</span> <span class='hs-varid'>vr</span><span class='hs-layout'>)</span>
<a name="line-109"></a> <span class='hs-conid'>RegReal</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>panic</span> <span class='hs-str'>"Reg.getHiVRegFromLo"</span>
<a name="line-110"></a>
<a name="line-111"></a>
<a name="line-112"></a><a name="RealReg"></a><span class='hs-comment'>------------------------------------------------------------------------------------</span>
<a name="line-113"></a><a name="RealReg"></a><span class='hs-comment'>-- | RealRegs are machine regs which are available for allocation, in</span>
<a name="line-114"></a><a name="RealReg"></a><span class='hs-comment'>-- the usual way. We know what class they are, because that's part of</span>
<a name="line-115"></a><a name="RealReg"></a><span class='hs-comment'>-- the processor's architecture.</span>
<a name="line-116"></a><a name="RealReg"></a><span class='hs-comment'>--</span>
<a name="line-117"></a><a name="RealReg"></a><span class='hs-comment'>-- RealRegPairs are pairs of real registers that are allocated together</span>
<a name="line-118"></a><a name="RealReg"></a><span class='hs-comment'>-- to hold a larger value, such as with Double regs on SPARC.</span>
<a name="line-119"></a><a name="RealReg"></a><span class='hs-comment'>--</span>
<a name="line-120"></a><a name="RealReg"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>RealReg</span>
<a name="line-121"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RealRegSingle</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>RegNo</span>
<a name="line-122"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>RealRegPair</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>RegNo</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>RegNo</span>
<a name="line-123"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>)</span>
<a name="line-124"></a>
<a name="line-125"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Uniquable</span> <span class='hs-conid'>RealReg</span> <span class='hs-keyword'>where</span>
<a name="line-126"></a> <span class='hs-varid'>getUnique</span> <span class='hs-varid'>reg</span>
<a name="line-127"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-128"></a> <span class='hs-conid'>RealRegSingle</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mkUnique</span> <span class='hs-chr'>'S'</span> <span class='hs-varid'>i</span>
<a name="line-129"></a> <span class='hs-conid'>RealRegPair</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mkUnique</span> <span class='hs-chr'>'P'</span> <span class='hs-layout'>(</span><span class='hs-varid'>r1</span> <span class='hs-varop'>*</span> <span class='hs-num'>65536</span> <span class='hs-varop'>+</span> <span class='hs-varid'>r2</span><span class='hs-layout'>)</span>
<a name="line-130"></a>
<a name="line-131"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Outputable</span> <span class='hs-conid'>RealReg</span> <span class='hs-keyword'>where</span>
<a name="line-132"></a> <span class='hs-varid'>ppr</span> <span class='hs-varid'>reg</span>
<a name="line-133"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-134"></a> <span class='hs-conid'>RealRegSingle</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>text</span> <span class='hs-str'>"%r"</span> <span class='hs-varop'><></span> <span class='hs-varid'>int</span> <span class='hs-varid'>i</span>
<a name="line-135"></a> <span class='hs-conid'>RealRegPair</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>text</span> <span class='hs-str'>"%r("</span> <span class='hs-varop'><></span> <span class='hs-varid'>int</span> <span class='hs-varid'>r1</span> <span class='hs-varop'><></span> <span class='hs-varid'>text</span> <span class='hs-str'>"|"</span> <span class='hs-varop'><></span> <span class='hs-varid'>int</span> <span class='hs-varid'>r2</span> <span class='hs-varop'><></span> <span class='hs-varid'>text</span> <span class='hs-str'>")"</span>
<a name="line-136"></a>
<a name="line-137"></a><a name="regNosOfRealReg"></a><span class='hs-definition'>regNosOfRealReg</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RealReg</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>RegNo</span><span class='hs-keyglyph'>]</span>
<a name="line-138"></a><span class='hs-definition'>regNosOfRealReg</span> <span class='hs-varid'>rr</span>
<a name="line-139"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>rr</span> <span class='hs-keyword'>of</span>
<a name="line-140"></a> <span class='hs-conid'>RealRegSingle</span> <span class='hs-varid'>r1</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>r1</span><span class='hs-keyglyph'>]</span>
<a name="line-141"></a> <span class='hs-conid'>RealRegPair</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>r1</span><span class='hs-layout'>,</span> <span class='hs-varid'>r2</span><span class='hs-keyglyph'>]</span>
<a name="line-142"></a>
<a name="line-143"></a>
<a name="line-144"></a><a name="realRegsAlias"></a><span class='hs-definition'>realRegsAlias</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RealReg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RealReg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-145"></a><span class='hs-definition'>realRegsAlias</span> <span class='hs-varid'>rr1</span> <span class='hs-varid'>rr2</span>
<a name="line-146"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>not</span> <span class='hs-varop'>$</span> <span class='hs-varid'>null</span> <span class='hs-varop'>$</span> <span class='hs-varid'>intersect</span> <span class='hs-layout'>(</span><span class='hs-varid'>regNosOfRealReg</span> <span class='hs-varid'>rr1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>regNosOfRealReg</span> <span class='hs-varid'>rr2</span><span class='hs-layout'>)</span>
<a name="line-147"></a>
<a name="line-148"></a><a name="Reg"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-149"></a><a name="Reg"></a><span class='hs-comment'>-- | A register, either virtual or real</span>
<a name="line-150"></a><a name="Reg"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Reg</span>
<a name="line-151"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RegVirtual</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>VirtualReg</span>
<a name="line-152"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>RegReal</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>RealReg</span>
<a name="line-153"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>)</span>
<a name="line-154"></a>
<a name="line-155"></a><a name="regSingle"></a><span class='hs-definition'>regSingle</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RegNo</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Reg</span>
<a name="line-156"></a><span class='hs-definition'>regSingle</span> <span class='hs-varid'>regNo</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RegReal</span> <span class='hs-varop'>$</span> <span class='hs-conid'>RealRegSingle</span> <span class='hs-varid'>regNo</span>
<a name="line-157"></a>
<a name="line-158"></a><a name="regPair"></a><span class='hs-definition'>regPair</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RegNo</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegNo</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Reg</span>
<a name="line-159"></a><span class='hs-definition'>regPair</span> <span class='hs-varid'>regNo1</span> <span class='hs-varid'>regNo2</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RegReal</span> <span class='hs-varop'>$</span> <span class='hs-conid'>RealRegPair</span> <span class='hs-varid'>regNo1</span> <span class='hs-varid'>regNo2</span>
<a name="line-160"></a>
<a name="line-161"></a>
<a name="line-162"></a><span class='hs-comment'>-- We like to have Uniques for Reg so that we can make UniqFM and UniqSets </span>
<a name="line-163"></a><span class='hs-comment'>-- in the register allocator.</span>
<a name="line-164"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Uniquable</span> <span class='hs-conid'>Reg</span> <span class='hs-keyword'>where</span>
<a name="line-165"></a> <span class='hs-varid'>getUnique</span> <span class='hs-varid'>reg</span>
<a name="line-166"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-167"></a> <span class='hs-conid'>RegVirtual</span> <span class='hs-varid'>vr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>getUnique</span> <span class='hs-varid'>vr</span>
<a name="line-168"></a> <span class='hs-conid'>RegReal</span> <span class='hs-varid'>rr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>getUnique</span> <span class='hs-varid'>rr</span>
<a name="line-169"></a>
<a name="line-170"></a><span class='hs-comment'>-- | Print a reg in a generic manner</span>
<a name="line-171"></a><span class='hs-comment'>-- If you want the architecture specific names, then use the pprReg </span>
<a name="line-172"></a><span class='hs-comment'>-- function from the appropriate Ppr module.</span>
<a name="line-173"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Outputable</span> <span class='hs-conid'>Reg</span> <span class='hs-keyword'>where</span>
<a name="line-174"></a> <span class='hs-varid'>ppr</span> <span class='hs-varid'>reg</span>
<a name="line-175"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-176"></a> <span class='hs-conid'>RegVirtual</span> <span class='hs-varid'>vr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>ppr</span> <span class='hs-varid'>vr</span>
<a name="line-177"></a> <span class='hs-conid'>RegReal</span> <span class='hs-varid'>rr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>ppr</span> <span class='hs-varid'>rr</span>
<a name="line-178"></a>
<a name="line-179"></a>
<a name="line-180"></a><a name="isRealReg"></a><span class='hs-definition'>isRealReg</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Reg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-181"></a><span class='hs-definition'>isRealReg</span> <span class='hs-varid'>reg</span>
<a name="line-182"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-183"></a> <span class='hs-conid'>RegReal</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-184"></a> <span class='hs-conid'>RegVirtual</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-185"></a>
<a name="line-186"></a><a name="takeRealReg"></a><span class='hs-definition'>takeRealReg</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Reg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>RealReg</span>
<a name="line-187"></a><span class='hs-definition'>takeRealReg</span> <span class='hs-varid'>reg</span>
<a name="line-188"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-189"></a> <span class='hs-conid'>RegReal</span> <span class='hs-varid'>rr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>rr</span>
<a name="line-190"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-191"></a>
<a name="line-192"></a>
<a name="line-193"></a><a name="isVirtualReg"></a><span class='hs-definition'>isVirtualReg</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Reg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-194"></a><span class='hs-definition'>isVirtualReg</span> <span class='hs-varid'>reg</span>
<a name="line-195"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-196"></a> <span class='hs-conid'>RegReal</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-197"></a> <span class='hs-conid'>RegVirtual</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-198"></a>
<a name="line-199"></a><a name="takeVirtualReg"></a><span class='hs-definition'>takeVirtualReg</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Reg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>VirtualReg</span>
<a name="line-200"></a><span class='hs-definition'>takeVirtualReg</span> <span class='hs-varid'>reg</span>
<a name="line-201"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-202"></a> <span class='hs-conid'>RegReal</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-203"></a> <span class='hs-conid'>RegVirtual</span> <span class='hs-varid'>vr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>vr</span>
<a name="line-204"></a>
<a name="line-205"></a>
<a name="line-206"></a><a name="liftPatchFnToRegReg"></a><span class='hs-comment'>-- | The patch function supplied by the allocator maps VirtualReg to RealReg</span>
<a name="line-207"></a><span class='hs-comment'>-- regs, but sometimes we want to apply it to plain old Reg.</span>
<a name="line-208"></a><span class='hs-comment'>--</span>
<a name="line-209"></a><span class='hs-definition'>liftPatchFnToRegReg</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>VirtualReg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RealReg</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Reg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Reg</span><span class='hs-layout'>)</span>
<a name="line-210"></a><span class='hs-definition'>liftPatchFnToRegReg</span> <span class='hs-varid'>patchF</span> <span class='hs-varid'>reg</span>
<a name="line-211"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reg</span> <span class='hs-keyword'>of</span>
<a name="line-212"></a> <span class='hs-conid'>RegVirtual</span> <span class='hs-varid'>vr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegReal</span> <span class='hs-layout'>(</span><span class='hs-varid'>patchF</span> <span class='hs-varid'>vr</span><span class='hs-layout'>)</span>
<a name="line-213"></a> <span class='hs-conid'>RegReal</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>reg</span>
<a name="line-214"></a>
<a name="line-215"></a>
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